Yup, no problems here either with the download, install, and the use of installed programs. But the download is 4.6GB is size so depending on the speed of your I'Net connection it might be easier letting it download overnight and then do the install the following morning.

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Always burn your bridges. You never know who's coming up from behind.

I did have to manually upgrade my Pages, Numbers, and Keynote apps though.

Yes, those appear to be separate downloads. And as is not uncommon, App Store is wonky. It kept restarting the downloads of Pages and Keynote. Then it suddenly showed Numbers as installed and the button turned to Open. But that opened Numbers 09. It showed Safari 10 as an available download until I restarted App Store. I think this is all related to our DSL being slow.

"Design is not just what it looks like and feels like. Design is how it works."
Steve Jobs